The Spurs, a team full of veteran players and coaches, let the clock run out without fouling down four with less than 20 seconds to play.
The Spurs must win in Denver to clinch the playoff series with the Nuggets, leading to a warning from Demar DeRozan.
The San Antonio Spurs must win on the road to clinch the playoff series with the Denver Nuggets, leading to a warning from Demar DeRozan.
The Western Conference first-round series between the San Antonio Spurs and Denver Nuggets will be decided by a seventh and final game.
The Spurs took control with a 17-2 run to open the fourth quarter and cruised from there.
The Toronto Raptors and Philadelphia 76ers will meet in the second round, while Damian Lillard beat the Oklahoma City Thunder at the death.
The NBA fined San Antonio Spurs star DeMar DeRozan $25,000 after he threw a ball at a referee on Saturday.
The incident occurred in the Spurs' 117-103 loss to the Nuggets on Saturday.
With the Spurs down 110-92, DeRozan was called for a charge on Nuggets guard Gary Harris after driving to the hoop.
The Philadelphia 76ers claimed a commanding 3-1 lead in the Eastern Conference opening-round series after topping the Brooklyn Nets.